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Article: Crystallite


Crystallite Structure

  • Crystallites can have random or directed orientation.
  • Amorphous materials lack structure.
  • Polycrystalline materials are composed of multiple crystallites.
  • Most inorganic solids are polycrystalline.
  • Grain boundaries are the areas where crystallites meet.

Crystallite Size

  • Crystallite size can be determined using X-ray diffraction or electron microscopy.
  • Solid objects are rarely composed of a single crystal.
  • Crystallite size can vary from nanometers to millimeters.
  • Monodisperse microstructures have uniform crystallite size.
  • Some materials, like gems and certain fibers, can be single crystals.

Effects on Material Physical Properties

  • Crystallinity affects the physical properties of a solid.
  • Different allotropic forms of sulfur have different properties.
  • Powder grains can be composed of smaller polycrystalline grains.
  • Polycrystals cannot be superheated and will melt promptly.
  • Material fractures can be intergranular or transgranular.

Grain Boundaries

  • Grain boundaries are interfaces where crystals of different orientations meet.
  • Grain boundaries contain dislocations and impurities.
  • Five variables are required to define a grain boundary.
  • Grain boundaries disrupt the motion of dislocations.
  • Reducing grain size improves strength without sacrificing toughness.

Grain Boundary Migration

  • Grain boundary migration plays a role in creep mechanisms.
  • Fine-grained materials have poor resistance to creep at high temperatures.
  • Grain boundaries are sources and sinks of point defects.
  • Migration rate in grain boundaries depends on the angle between adjacent grains.
  • Grain boundaries become a significant volume fraction in nanocrystalline solids.

Crystallite Data Sources

Reference URL
Knowledge Graph

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